Bug#774896: Exynos4 CONFIG_HZ
Hi,
On Mon, Jan 19, 2015 at 11:23:04AM +0100, Krzysztof Kozłowski wrote:
> 2015-01-18 17:57 GMT+01:00 Sten Spans :
> >
> > With the improvements in upstream support for exynos4 devices
> > I've been looking into adding support odroid devices to Debian's
> > armmp kernel. The kernel config changes needed are quite minimal
> > as can be seen here:
> >
> > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774896
> >
> > Mostly enabling support and various modules.
> >
> > However as Ian Campbell notes, enabling ARCH_EXYNOS4 triggers
> > the following from arch/arm/Kconfig:
> > config HZ_FIXED
> > int
> > default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
> > ARCH_S5PV210 || ARCH_EXYNOS4
> > default AT91_TIMER_HZ if ARCH_AT91
> > default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
> > default 0
> >
> > This forces CONFIG_HZ=200 for the entire armmp kernel, which is
> > undesirable. The reason for this setting isn't very clear to either
> > me or Ian. I personally have verified that HZ=250 (the default for debian
> > armmp kernels) boots fine.
> >
> > Is there a particular reason for this setting?
> > Would a patch removing this requirement for ARCH_EXYNOS4 be accepted?
>
> +Cc Kukjin Kim
>
> I cannot find a valid reason for fixed 200 Hz, especially that other
> values (<100, 1000>) are working. Maybe Kukjin will share some light
> on this?
I'm not sure if this bugreport is still relevant, but in any case
upstream changed this in da6b21e97e39 ("ARM: Drop fixed 200 Hz timer
requirement from Samsung platforms").
In case the bugreport is not anymore relevant, let's close it.
Regards,
Salvatore
Bug#774896: Exynos4 CONFIG_HZ
2015-01-18 17:57 GMT+01:00 Sten Spans s...@blinkenlights.nl: With the improvements in upstream support for exynos4 devices I've been looking into adding support odroid devices to Debian's armmp kernel. The kernel config changes needed are quite minimal as can be seen here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774896 Mostly enabling support and various modules. However as Ian Campbell notes, enabling ARCH_EXYNOS4 triggers the following from arch/arm/Kconfig: config HZ_FIXED int default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \ ARCH_S5PV210 || ARCH_EXYNOS4 default AT91_TIMER_HZ if ARCH_AT91 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY default 0 This forces CONFIG_HZ=200 for the entire armmp kernel, which is undesirable. The reason for this setting isn't very clear to either me or Ian. I personally have verified that HZ=250 (the default for debian armmp kernels) boots fine. Is there a particular reason for this setting? Would a patch removing this requirement for ARCH_EXYNOS4 be accepted? +Cc Kukjin Kim I cannot find a valid reason for fixed 200 Hz, especially that other values (100, 1000) are working. Maybe Kukjin will share some light on this? Best regards, Krzysztof -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/CAJKOXPfHBEKFKo=eygdk_8zspk4+23ydqqj7e07ghhfhs80...@mail.gmail.com
Bug#774896: Exynos4 CONFIG_HZ
With the improvements in upstream support for exynos4 devices I've been looking into adding support odroid devices to Debian's armmp kernel. The kernel config changes needed are quite minimal as can be seen here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774896 Mostly enabling support and various modules. However as Ian Campbell notes, enabling ARCH_EXYNOS4 triggers the following from arch/arm/Kconfig: config HZ_FIXED int default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \ ARCH_S5PV210 || ARCH_EXYNOS4 default AT91_TIMER_HZ if ARCH_AT91 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY default 0 This forces CONFIG_HZ=200 for the entire armmp kernel, which is undesirable. The reason for this setting isn't very clear to either me or Ian. I personally have verified that HZ=250 (the default for debian armmp kernels) boots fine. Is there a particular reason for this setting? Would a patch removing this requirement for ARCH_EXYNOS4 be accepted? -- Sten Spans There is a crack in everything, that's how the light gets in. Leonard Cohen - Anthem -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/alpine.deb.0.9.1501181744400.30...@zem.blinkenlights.nl
